Hi Linus, Here it is the Compiler Attributes series/tree, which tries to disentangle the include/linux/compiler*.h headers and bring them up to date. The patches have been in linux-next for a while, *except* the last two from Nick which came a bit later. Since AFAIU there will be no linux-next this week, I included them here; but let me know if you prefer to take them out. You may see merge conflicts from a few other trees, from what we have seen in linux-next. I am not sure if you followed this, so please let me know if there is anything you don't agree with. And welcome back! Cheers, Miguel The following changes since commit 17b57b1883c1285f3d0dc2266e8f79286a7bef38: Linux 4.19-rc6 (2018-09-30 07:15:35 -0700) are available in the Git repository at: https://github.com/ojeda/linux.git tags/compiler-attributes-for-linus-4.20-rc1 for you to fetch changes up to 1ff2fea5e30ca15752777441ecb64a169fe22e9e: compiler-gcc: remove comment about gcc 4.5 from unreachable() (2018-10-19 08:47:30 +0200) ---------------------------------------------------------------- The Compiler Attributes series This is an effort to disentangle the include/linux/compiler*.h headers and bring them up to date. The main idea behind the series is to use feature checking macros (i.e. __has_attribute) instead of compiler version checks (e.g. GCC_VERSION), which are compiler-agnostic (so they can be shared, reducing the size of compiler-specific headers) and version-agnostic. Other related improvements have been performed in the headers as well, which on top of the use of __has_attribute it has amounted to a significant simplification of these headers (e.g. GCC_VERSION is now only guarding a few non-attribute macros). This series should also help the efforts to support compiling the kernel with clang and icc. A fair amount of documentation and comments have also been added, clarified or removed; and the headers are now more readable, which should help kernel developers in general. The series was triggered due to the move to gcc >= 4.6. In turn, this series has also triggered Sparse to gain the ability to recognize __has_attribute on its own. Finally, the __nonstring variable attribute series has been also applied on top; plus two related patches from Nick Desaulniers for unreachable() that came a bit afterwards. ---------------------------------------------------------------- Miguel Ojeda (15): Compiler Attributes: remove unused attributes Compiler Attributes: always use the extra-underscores syntax Compiler Attributes: remove unneeded tests Compiler Attributes: homogenize __must_be_array Compiler Attributes: remove unneeded sparse (__CHECKER__) tests Compiler Attributes: add missing SPDX ID in compiler_types.h Compiler Attributes: use feature checks instead of version checks Compiler Attributes: KENTRY used twice the "used" attribute Compiler Attributes: remove uses of __attribute__ from compiler.h Compiler Attributes: add Doc/process/programming-language.rst Compiler Attributes: add MAINTAINERS entry Compiler Attributes: add support for __nonstring (gcc >= 8) Compiler Attributes: enable -Wstringop-truncation on W=1 (gcc >= 8) Compiler Attributes: auxdisplay: panel: use __nonstring Compiler Attributes: ext4: remove local __nonstring definition ndesaulniers@xxxxxxxxxx (2): compiler.h: update definition of unreachable() compiler-gcc: remove comment about gcc 4.5 from unreachable() Documentation/process/index.rst | 1 + Documentation/process/programming-language.rst | 45 +++++ MAINTAINERS | 5 + drivers/auxdisplay/panel.c | 7 +- fs/ext4/ext4.h | 9 - include/linux/compiler-clang.h | 5 - include/linux/compiler-gcc.h | 74 +------ include/linux/compiler-intel.h | 9 - include/linux/compiler.h | 24 +-- include/linux/compiler_attributes.h | 258 +++++++++++++++++++++++++ include/linux/compiler_types.h | 101 ++-------- scripts/Makefile.extrawarn | 1 + 12 files changed, 345 insertions(+), 194 deletions(-) create mode 100644 Documentation/process/programming-language.rst create mode 100644 include/linux/compiler_attributes.h
